beeper unknown error LingInfoError 301

[kqvanity]

Can't connect to beeper.com.
After setting the username & passowrd, I get the following error message.
matrix.org does connect however. I've tested beeper with other matrix clients and it does work.

│13:47:01  beeper  -- │ matrix: Doing SSL handshake...
│13:47:01  beeper  -- │ matrix: Connected using TLSv1.3, and 256 bit TLS_AES_256_GCM_SHA384
│                     │ cipher suite.
│13:47:01  beeper  -- │ matrix: received certificate
│13:47:01  beeper     │  - certificate info:
│13:47:01  beeper     │     - subject: commonName=beeper.com, serial number
│13:47:01  beeper     │         04784F4.................
│13:47:01  beeper     │     - issuer: countryName=US, organizationName=Let's Encrypt,
│13:47:01  beeper     │         commonName=E6
│13:47:01  beeper     │     - key info: DSA key 256 bits, signed using ecdsa-with-SHA384
│13:47:01  beeper     │     - period of validity:
│13:47:01  beeper     │         Begins on:  Sep 20 13:18:43 2024 GMT
│13:47:01  beeper     │         Expires on: Dec 19 13:18:42 2024 GMT
│13:47:01  beeper     │     - fingerprints:
│13:47:01  beeper     │         SHA1:
│                     │ 0F:F1:80:.....................
│13:47:01  beeper     │         SHA256: 51:95:...............
│                     │ B:B4:E4...........
│13:47:01  beeper =!= │ matrix: Error: LoginInfoError: 301 unknown error