APs are not accepting DFS channel

[ramesh_pandey]

Hi, I have 5 APs at a site. 3 APs are on DFS channel range, however two of them on non DFS range.

2 non DFS APs are not accepting DFS channels, what could be the reason ?

[Ash_Finch]

Could you expand on the "not accepting DFS channels" e.g. are you trying to put the APs manually onto a DFS channel and getting an error for example?
Same AP model and firmware as the working ones?