[com.appgenix.bizcal] Business Calendar 2 pro license is not recognized

[mspro66]

Affected app
Name: Business Calendar 2 (v. 2.54.0)
Package id: com.appgenix.bizcal

Describe the bug
The pro license purchased is not recognized on this installation.

To Reproduce
Steps to reproduce the behavior:

1. Go to Business Calendar app
2. Click on 'sandwich menu' at the top left
3. Click on Go Pro (red bar)
4. Pro license purchase message appears

Expected behavior
On first login the app checks the existence of the pro license by enabling all features.

System
Android Version: 16
Custom ROM: LineageOS 23.2

microG
microG Core version: 0.3.15.250932
microG Self-Check results: All ticked

Additional context
In the "Google Play Store Services" setting, the 'Google Play Payments' switch is enabled. If not enabled in the app on the "Go Pro" screen, a rotating circle appears for a few minutes then the 'error' message appears.

[mspro66]

I'm not sure if this will be helpful, but here are some log entries from Logcat when launching the Business Calendar app:

[2026-05-23 11:45:37.184 Uid(value=10210):11128:11128 W/appgenix.bizcal]
Failed to find entry 'classes.dex': Entry not found
[2026-05-23 11:45:37.354 Uid(value=10210):11128:11187 W/appgenix.bizcal]
Unsupported class loader: java.lang.Class<com.google.android.gms.chimera.container.FilteredClassLoader>
[2026-05-23 11:45:37.747 Uid(value=10210):11128:11128 W/View]
requestLayout() improperly called by com.appgenix.bizcal.view.FavoriteBarStrip{9f21021 V.ED..... ......ID 0,0-1080,0} during layout:
running second layout pass
[2026-05-23 11:45:40.293 Uid(value=10210):11128:11135 W/appgenix.bizcal]
userfaultfd: MOVE ioctl seems unsupported: Connection timed out