Accessing iCloud.com using Safari or Safari Technology Preview is broken.
Selecting an iCloud login item in 1Password and clicking Go, or, after opening Safari or STP directly. a new dialog box appears with a suggested iCloud login ID. If "Continue with Password" is clicked, another dialog box pops up requesting the Password. 1Password does not recognize this. I have found two possible workarounds:
Having both a developers ID and a user ID, I often have to cancel the first dialog anyway.
Have your seen this? Do you have any ideas besides working up a Apple bug report?
macOS 10.15.7 (19H114) on Mac mini (2018)
Version 7.7.1.BETA-6 (70701006)