No AUv3 apps recognised by MG2 on iPhone

I started using MIDI Guitar 2 on my iPhone 11 (iOS 14.5.1) after some time “away” from the app, and I noticed that none of the AUv3 instrument and FX apps installed on the device, are being recognised and registered by MG2.

I have purchased MG2 and all the required IAPs, and have “scanned for plugins” within the app. If someone could please help or suggest what I may be doing (or not doing) wrong, I’d be most grateful?

Many thanks :pray:t2: