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I have seen this issue on other versions on macOS as well; I don't think this is specific to this version. You will need to trust the certificate when on the site click the padlock. Show the certificate in the details you should see the CA Issuers, click on the URI. (This will ensure the correct cert required is downloaded) it could be the ones in your keychain may vary. You can then add this certificate into keychain.
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What version of macOS are you currently running on the Mac Mini?
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This will only show if you have the following requirements:iPhone 6 or laterApple Watch Series 1 and 2 or laterThe latest version of iOS and watchOSAn Apple ID signed in to iCloudAn eligible payment card added to WalletBe in a location that supports transit cards with Apple PaySource: Pay for transit with Apple Pay if Express Transit mode isn't supported or enabled - https://support.apple.com/en-us/HT209545Current locations with Express Transit mode support:China mainlandBeijing: Beijing Transit cardsShanghai: Shanghai Transit cardsJapanAll forms of transit that accept SuicaUnited StatesNew York City: Metropolitan Transportation Authority (MTA) accepts payment cards in Wallet at select stations.Portland: TriMet accepts transit cards and payment cards in Wallet.Source: Where you can ride transit with Apple Pay - https://support.apple.com/en-gb/HT20795 8
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OpenConnect is an alternative, depending on what you are trying to connect to this might not be allowed. I have also not tested this on 10.15.
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What version of macOS are you currently running? What format did you select to create the volume?
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Just out of interest did you try wireless charging, if so was this the same result?
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I have seen this issue on other versions on macOS as well; I don't think this is specific to this version. You will need to trust the certificate when on the site click the padlock. Show the certificate in the details you should see the CA Issuers, click on the URI. (This will ensure the correct cert required is downloaded) You can then add this certificate into keychain.
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Some times this is caused by the date/time not being correct. Boot into recovery, go to utilities > terminal. To verify what the current date and time is type "date" if the date or time is wrong, try correcting it. The command to adjust date/time: "date mmddHHMMyyyy." If this is not the issue or you are still facing the problem after try reset the NVRAM or PRAM.Shut down your Mac, then turn it on and immediately press and hold these four keys together: Option, Command, P, and R. You can release the keys after about 20 seconds, during which your Mac might appear to restart.Reset NVRAM or PRAM on your Mac - https://support.apple.com/en-us/HT204063
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Might be an issue with the volume file system, have you tried reformatting the drive?
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They might offer the option to downgrade it but isn't guaranteed. I would only install betas on development devices; you can’t downgrade back to watchOS 5. It's usually isn't the most stable, a reason for no public beta. When beta 1 of watchOS 5 came out, it was pulled due to issues.
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Yeah, you need Xcode 11 beta or macOS 10.15 beta, then you can install via iTunes. If you are going to put macOS Catalina on your new Mac, you will be able to do this via Finder. Once your device is connected it will show in finder; you need to hold the option key click on update or restore and select the ipsw.
How are you trying to install this? Do you have one of the following requirements?Installing iOS 13 via iTunes requires Xcode 11 beta already installed or macOS 10.15 beta already installed.
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You can't downgrade watchOS 6 beta to watchOS 5. The only is by installing betas of watchOS 6 until the release. The only other option would be to try to arrange a Genius appointment to see if they will downgrade it, but this can take a while. You will need iOS 13 on your device to pair to watchOS 6.
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Download Apple Configurator 2 beta, and make the Apple TV is discoverable.Go to Apple Configurator > Paired Devices you should be able to pair your Apple TV. Drag the profile to the Apple TV; it will then ask you to click install on the Apple TV, once done it will restart, and you should be able to check for software updates.
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Have you tried resetting the NVRAM/ PRAM?Shut down your Mac, then turn it on and immediately press and hold these four keys together: Option, Command, P, and R. You can release the keys after about 20 seconds, during which your Mac might appear to restart.Reset NVRAM or PRAM on your Mac - https://support.apple.com/en-us/HT204063
