Ask Lemmygrad

You may need Google Play Services. On LineageOS, you need to install the MindTheGapps package after installing the OS and before you boot into the phone for the first time: https://wiki.lineageos.org/gapps/

If you are waiting on the SMS but can launch XHS, I suspected my custom ROM and rooted phone were causing issues with XHS (and you will get banned if you try making a WeChat account on such a device), too, but I managed to get an SMS the next day but still had to wait for the SMS limit to pass (and it was of course expired by then). That evening, I entered my phone number again, immediately got an SMS, entered the code, and it worked. I do have the Shamiko module installed with Magisk, so maybe that made a difference.