In addition to the phone's native cell calling, I use Google Voice for phone calls ... I've never experienced this issue using Voice, so the issue is obviously something amiss with the native phone functionality.
Hello @chrispy0 ,
This issue may happen due to temporary network issues. If issue happens again, Please update Samsung members app to latest version from galaxy store and send us an error report immediately after experiencing the issue from the Samsung member’s app -> Beta Feedback -> Error Reports to help us debug the issue. We apologize for the inconvenience and appreciate your contribution to the beta program.
One UI Beta Team