Outlook Mobile 5.2623.0 Android - Addins hang whilst loading

I develop and addin and have been testing it, only recently after update to latest Outlook Mobile on Android, it hangs during Office.onReady()
I've tested it on 2 different devices and also tried other addins which also fail to load.

• Outlook Mobile 5.2623.0 on Android
• Office.context.mailbox is null, Office.onReady() never resolves
• Reproducible with multiple vendors (my own adding and two Zoho add-ins)
• Two devices, different OS versions - Samsung One UI 8.0 and 8.5 (Android 16)
• Regression: add-ins worked prior to this update

Appreciate any help. Thanks