Try the following: 1) Turn off WiFi 2) put the phone in 2G/3G mode 3) try to set the conditional forwarding either by the menu or hash codes. I find that sometimes LTE just doesn’t get along with GSM service codes and WiFi Calling is totally out. This worked for me!
I was having the same problem when connected to WiFi or to the regular network. Temporarily switching to 2g allowed me to change the forwarding numbers.
I just started having the same problem about 3 days ago. Has there been any progress on this issue?
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