I too am having this issue, started with the latest 2.6.3 update. It stopped placing phone calls. Mint Mobile recommended I re-install the e-SIM. Having the exact same issue as above. Tried a new line from US Mobile with an eSIM (also using their T-Mobile network) - same issue. I did a full factory reset - still nothing.
I’ve ordered a physical SIM but it won’t be here for a week (and we’ll see if even that works). This is clearly related to 2.6.3 - phone has otherwise been working fine for ~1 year. Murena needs to fix this ASAP - this is a $500 device I purchased from them that they bricked with an OTA.