Hi,
The value range of Maximum bandwidth is 128-10000000 kbit/s. So, the maximum range of the DBA profile type 4 is 10000000 kbit/s.

You cannot exceed this value. if you are using the DBA within this range, I ask you to evaluate the following points:
Check the available bandwidth of the PON port. If sufficient, go to step 2 or 3
Decrease the bandwidth of the Line profile.
Add the ONT to another PON port,
i hope it helpful!