EnOcean PTM 215Z Unable to join in 'adjacent' building?

In my house I have 11 of these Green power push buttons.
So I know these devices pretty good and they have always worked well.

In my garage I have a total of 30 Zigbee devices.
At the spot I’m installing the new PTM 215Z there is (within 2 meters) multiple:
IKEA LED2106R3 & IKEA LED1923R5 & SONOFF ZBMINI
All these devices have good connection and should all be able to route Green Power messages.
When I’m at the intended spot, I’m not able to join (z2m).
If I bring the push button inside my house (where my Skyconnect is located) I can join but if I then take the push button back to the garage LQI will be below 10 and not working.

Any advice is much appreciated.

Nobody’s experienced something similar?

Even though I believe I have confirmed that the mentioned devices can route ZGP messages, I have now added a (confirmed) LED2103G5 at the spot.
This made no difference.