Hey after struggling with this for an hour or two, I found that in your apple developer account, under 'Certificates, Identifiers & Profiles' profiles provisioning profiles, I needed to add the device I was using to test on in there, it takes you through steps. At the end you download a file (file will be named whatever you choose), when downloaded, double click the file and....magic, it works. I've never had this issue until I moved up to Xcode 12.5. Hope it helps.
jmstrlr1
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