HiShane Devenshire , Thank you for posting to the Microsoft community. Based on the description, it seems that you got a lot of error when trying to save your Excel.
We understand the importance of this case to be addressed. Allow us to check on this and we’ll assist you in the best way we can. Before anything else, let me ask you the following questions below so that I fully understand the problem.
- What is the version and exact product information for your Basic 365? Is it Microsoft 365 Home/Personal or Enterprise? For instructions, see this article About Office: What version of Office am I using? - Microsoft Support
- How long does the issue started?
- What changes did you make prior to this issue?
Kindly check this article and follow the steps recommended from the it.
You may check the thread below as well that is related to your issue and may follow the steps recommended from the moderator.
We look forward to your response.Truly Yours,FatimaMicrosoft Moderator