No service when using e-sim for data and nano-sim for calls

I've been using e-sim mainly for data-while I used nano sim for calls. Since back few days, I've lost service on my nano sim. My e-sim line works perfectly fine, but my nano sim line loses service.

My solution was to unify data and call line to my primary (nano sim) line. Now I can't use the esim for data and the nano sim for calls.

Any ideas what may be the problem? (I'm guessing software issues)

Thanks in advance!