Microsoft have released a new build of 2310 which resolves this issue. Please ensure you are on 2310 build number 16.0.16924.20124 or later.
issue
A change made on the latest version of Microsoft 365 (2310) results in our Excel Add-in crashing frequently, leaving it unusable.
workaround
Rollback to an earlier version of Microsoft 365. Please find the latest supported version below:
https://help.anaplan.com/check-your-software-versions-and-settings-for-the-excel-add-in-0740fa5b-4a36-4b92-9169-94fecaa631ca
