CAT-M Device Attach Call Flow and Troubleshooting

Dear Experts,

Could you please provide the call flow specific to CAT-M devices?

I am currently facing an issue where CAT-M users are unable to attach to the network. The eNodeB is releasing UEs due to RLC delivery failures on SRB1.

What could be the potential causes for this issue, and how does the attach procedure flow for CAT-M devices?