and so, OP’s SSO problems are null since eOS has no issue running it due to it just being android under the hood.

that apk doesn’t install on arm Linux. Comparing eOS to Postmarket is apples to oranges. eOS is still chained by the buttcheeks to AOSP and Android.

AOSP may not contain google services, but you’re still at their mercy. No Google = No AOSP, or whenever they feel like it. Tomorrow, maybe.