If you experience issues you can try common fixes first:
Try to restart SNAP with the companion running
Have a look if SNAP/Steam and the Untapped Companion are run on admin
Untapped.gg Android App for Marvel SNAP
We are currently experiencing a problem with our Marvel SNAP Android Companion App. Due to a recent Google security update, the App is unable to access SNAP's files, which means it cannot track matches or update collections. Despite trying different solutions, we have not been able to find a long-term fix for this issue.
Some users have reported that they were able to grant access to the App by uninstalling the "File" app updates. To do this, you can follow this path:
Settings -> Apps -> All Apps -> File -> 3 dot menu -> Uninstall updates.
Although this is not an ideal scenario, it has worked for some users. We understand how important it is for you to have the App working properly and we will keep you informed of any updates we might have.
If this didn't help, please send us a email to support@untapped.gg so we can have a look together with you!