3GPP 24.501 v20.0.0 — the document's own text
5.2.2.3.1 NORMAL-SERVICE
Taught in 4. Inside TS 24.501, the document at the centre (CT1 — the group that writes what your phone says, overview).
The UE shall initiate an initial registration procedure if the timer T3346 is not running. If timer T3346 is running, the UE shall initiate an initial registration procedure on the expiry of timer T3346.
The UE may initiate an initial registration procedure for emergency services or for a UE configured for high priority access in selected PLMN or SNPN, even if timer T3346 is running.