Network not sending Attach Accept

Anyone having idea if network not sending attach accept, then what can be reason?
Attach type is combined attach.
Case for LTE.

If signal there and in emergency mode it is working and from neighbor site handover possible to source site.
Are RRC setup complete happening?

If like this then EPC delay, CORE.


It’s very abnormal scenario observed activate default bearer request there but no attach accept seen so attach fail finally.

Check TAC in core and eNodeB definition. Is it same?
TAC of your site and 1st tier and core defined TAC. Is it same?
Because if TAC different I think it will go emergency mode.

Is it ICR region?

No, not ICR.

Hey, do you have logs where you see the failure ot detach? Like during rrc or authentication msg?