Rointe Heaters Integration

Having previously installed the Rointe integration in the past (which worked well) I’ve now needed to fully recreate my HA installation (which is running in Docker). This time round when I install via HACS and add the integration when I setup my credentials for Rointe Cloud HA finds my Rointe installation but I now get an error saying “Failed setup, will retry: ‘schedule_day’” It seems that there is a problem pulling my configuration from the cloud. In my log I see the following:
Unexpected error fetching rointe data
19:05:45 – (ERROR) Rointe Heaters (custom integration) - message first occurred at 18:54:42 and shows up 15 times
Error during authentication: Authentication returned 400 (Bad Request)
18:58:09 – (ERROR) Rointe Heaters (custom integration)

I’ve tried both a fresh setup of Rointe as well and copying my previous backup over but both fail with the same issue. I’ve tried pulling different versions of the Rointe integration from GitHub - tggm/rointe-hacs: A HACS repo for the Home Assistant Rointe Integration without any luck. Current version is 1.4.3. Is anyone else seeing this issue? I suspect that Rointe may have changed their API but I can’t tell. Any suggestions for solving this issue?