ePMP 3000 rejects SM connection

i have multiple ePMP 3000 that are rejecting SM connections. the AP has zero SMs, synchronization source set to GPS and the GPS is tracking and is synced. Operating Frequency Channel shows no interference.

Hello @Egbert_Diego,

Could you please share what you observe on the SMs when they are unable to connect?
For example, do they continue scanning for the AP, and is there any reported disconnect reason?

Thank you!