I fully agree with Nick.
Seems like the Backblaze answer was a bit automatic like mine:
but without taking any time to look into your errors:
Get "https://api.backblazeb2.com/b2api/v1/b2_authorize_account": dial tcp 104.153.233.180:443: i/o timeout
Post "https://api003.backblazeb2.com/b2api/v1/b2_list_file_names": dial tcp: lookup api003.backblazeb2.com: no such host
Both errors indicate a network issue contacting (dialing) the servers at Backblaze and have absolutely nothing to do with the API version. The errors happen while trying to send the API request and basicaly says "recipient not answering/unknown".
I checked your other post and guess you have an issue with the stability of your local network. This is not that uncommon if using WiFi and Windows. Here are a few things to check:
Open a terminal and let this command run while using rclone (or just generally):
ping -t api.backblazeb2.com
if you see a period with "Request timed out" or "General failure" then try checking the Event Viewer for errors/warnings. You may see "WLAN-Autoconfig" which is Windows resetting your network card/driver after connection issues (could be network noise, incompatible router etc etc).