This looks to be a known case; however, let me first ask if you're going to back up both Exchange Online and SharePoint Online/OneDrive data? and also, if you're using MFA for your O365?
It's likely that you're experiencing the following known issue: You've added an entire organization to the scope and VBO is trying to process all the possible objects, including SharePoint/OneDrive. To fix this, go the backup job settings and uncheck OneDrive and Site on the Edit Processing Options screen. Can you try it and let me know if it helps?
Thanks!
you are wrong i didn't add entire organization... i added 13 mailboxes that all..and in the exclude window i didn't touch at all. you can see the images below
Thanks for the additional screenshots!
May I also ask you to check the following: Edit your backup job -> select any user from the list -> click Edit and see if all the checkboxes (mail, archive, OneDrive and Site) are checked?
And if your screen is similar to mine above, can you uncheck OneDrive and Site and restart the job?