I have been having this issued for 2 days. I have tried everything listed, but I have only one version of Xcode, which is 12.4. I restarted everything, updated to Big Sur, changed network settings, logged out and back into Xcode, unchecked the box to send info to Apple. I am unable to upload my app update.
The last time I used Xcode was about a year ago, with no problems.
Dpride42
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