Hi Jacko
I'm AnnaThomas and I'd be happy to help you with your question. In this Forum, we are Microsoft consumers just like yourself.
The Excel error 1001 typically occurs when there is an issue with the authentication process, which can be caused by various factors. Here are some steps you can take to try and resolve this issue:
Check if you are using the correct account and password. Ensure that you are entering the correct login credentials for your Excel account. Double-check your username and password to make sure they are correct.
Clear your Excel app cache. Sometimes clearing the cache can help resolve authentication issues. Go to the Settings app on your iPhone, select "General," then "iPhone Storage," find the Excel app and select "Offload App" and then "Reinstall App".
Try logging in using another device. If you have access to another device, such as a computer or tablet, try logging in to Excel using that device. This can help you determine if the issue is specific to your iPhone.
Check your network connection. Make sure you have a stable and strong network connection on your iPhone. Poor network connectivity can cause authentication issues.
I hope this helps ;-), let me know if this is contrary to what you need, I would still be helpful to answer more of your questions.
Best Regards,
AnnaThomas
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