Go to your phone dialler pad > Menu (3 dots top right) > Settings > Wi-Fi calling... check that it is enabled.
New head ache for me, i had to factory reset phone as Android 12 is flaky
now Wifi Calling option missing, called up Vodafone and had it reactivated
Only problem is it doesnt work properly. When Wifi calling is enabled and in Wifi area its fine make and receive calls.
If i step out of my house and have no wifi , i cant make or recieve calls. unless i manually disconnect wifi calling
Vodafone Escalating the issue but have to wait 3 days before they get back to me, i dont live in a particularly good reception area so rely on wifi calling
Thanks Samsung and Vodafone, dont know who is at fault my guess Samsung as it worked fine on Android 11, but i could be wrong
Have had this issue since getting my phone December of '21 so I followed your steps (couldn't do Step 1 since the option to do so was greyed out) and it fixed my issue! I no longer have to wait several minutes while the phone attempts to dial! Thank you so much. I have no idea how you figured out that this was the solution, but by the grace of god I can actually call and text in a building now. Thank you good sir or madam.