Yes, in the Auth handling, up to 5 times with exponential backoff from 2 to 32 s. This is not configurable. After that, there is a generic retry capability (for all backends, not specific to B2) configured with number-of-retries (default 5), retry-delay (default 10s), and retry-with-exponential-backoff (default false, double the value for retry-delay for each retry configured with number-or-retries).
You can monitor what is doing Duplicati by using the live log (About / Show log) at retry level (it will show only the generic retry, not the specific B2 one)
If Duplicati does not retry in the live log, it may be a problem in the B2 driver.
If it retries but it’s not enough, try to set exponential backoff to true.
There is a possibility