Update: Confirmed profile was able to download after following Holgr’s trick. Copied the address for the WatchOS 6 beta listed further below on the page and replaced the two 6’s with 7’s.
Successfully downloaded the beta after updating on the watch itself, instead of using the Watch app on iOS
Further details:
Apple Watch Series 4 (MTV62LL/A) running WatchOS 6.2.6
iPhone XS Max (NT6L2LL/A) running IOS 14 Beta 1
Bambam2098
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Same issue here: unknown error has occurred when trying to download the profile