Cannot connect my Samsung Galaxy 9+ to Ex6120 5G

[LurchUSA]

I can connect my Samsung Galaxy 9+ to the Ex6120 using the 2.4 GHz band, however when I try to connect to the 5G, I get an error stating "Cannot allocate IP address".

I pretty much kept everything as default for the EX6120 setup, and my Samsung Galaxy 9+ can connect to my R6300v2 router 5G signal, so what is going on here?

[StephenB]

Do other devices also have this problem, or is it only the Galaxy S9+?