I can't help but think it's because you've connected to your partner's account at one point (as stated in one of your earlier posts) somehow.
Handsome Dan Has Spoken.
Handsome Dan is currently WFH.
Handsome Dan is perplexed...and a little stir crazy.
Handsome Dan is transitioning back to normal life one day a week..
Handsome Dan is trying not to sweat the small stuff..and sometimes succeeds
Hey I'll see what I can find out, & help with..
When you say you've tested it with your partners SIM (Spark Digital), did you have it connected via dual number and eSIM previously on your partners account?
Are you able to PM me some details of your number etc.
Also as discussed by previous posters, please post a screenshot.