wAP LTE - Private APN not working on 3G only Areas

Good day

We have a problem with the WAP router we can connect with APN settings and username and password on LTE connection and it works perfectly
But we have 11 sites that’s only 3G HSDPS & HSUPA then the authentication does not work at all

I did do some testing myself at office if i setup WAP and add APN settings with authentication it works on LTE perfectly as soon as a only choose network mode gsm and 3g only the link does not want to register.

I did add sipout.rif files so that you can have a look

This WAP Router LTE firmware is on “MikroTik_CP_2.160.000_v005”
Software on WAP is v6.41rc52

This will be fixed in the RC53 or RC54