Let's see if I can get this right this time 
MSPro is up to 2.9.6 for Android. Companion is up to 3.0.4. The change log for companion shows: 3.0.1 requires MSP 2.7.8 or later; 2.8.4 requires 2.6.4; 2.8.1 requires 2.4.7. So it looks like you have version disease. 
You will probably have to uninstall the old companion and reinstall and you will probably have to go to your original purchase point of MSP to upgrade MSP. I just upgrade from the play store. The companion should just download from zubersoft.com. If that's where the problem is, I'm lost. Mike or someone more knowledgeable will need to step up.
MSPro is up to 2.9.6 for Android. Companion is up to 3.0.4. The change log for companion shows: 3.0.1 requires MSP 2.7.8 or later; 2.8.4 requires 2.6.4; 2.8.1 requires 2.4.7. So it looks like you have version disease. You will probably have to uninstall the old companion and reinstall and you will probably have to go to your original purchase point of MSP to upgrade MSP. I just upgrade from the play store. The companion should just download from zubersoft.com. If that's where the problem is, I'm lost. Mike or someone more knowledgeable will need to step up.
Dell Latitude 13.5" 2-in-1 Ubuntu/Win 11
Samsung Note Pro SM-P900 12.2 Android 5.0.2
Samsung S7+, Android 12
Samsung Note Pro SM-P900 12.2 Android 5.0.2
Samsung S7+, Android 12