Source_regex not working in table routing : Found matching outbound route for... but declined sender

[hadpro24]

I configured routing with source regex which does not work: here is my config on the table in the source_regex column (the same value for both directions): ^(Nim|SMS 8075)$

But the client manages to send with another source_addr which is not in this list.

In the ksmppd logs: Found matching outbound route for ... but declined sender ...

What am I not configuring correctly?