I've had a VM with a backup job to S3 storage get this error (the same error also appears on retry):

"Invalid RFC7231 date-time value 2026-09-15T16:44:47Z. Deserialization error: to see the raw response, inspect the hidden field {error}.$response on this object."

Host and VM time are correct. S3 remote test works.
Other backups to the same bucket, different folder and different remote do work.
The snapshot gets created but is deleted after around 5-10seconds on the retry.
I can make a new remote to a new folder in the bucket and attempt other troubleshooting steps, just thought I'd mention this one in case it helps others because I did not find much of a record for it in the documentation or searches.

Has anyone seen the error before? Let me know if you need more info on this.

Thanks,

J