The following error message appears:​ ​'Microsoft Excel is waiting for another application to complete an OLE action.'
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This is an internal error within Excel, often related to communication issues between Excel and other applications through OLE (Object Linking and Embedding).

Since this is a Excel program level issue, please contact your IT department for assistance in troubleshooting and resolving the error.

In many cases, simply restarting your computer or server can resolve the issue.
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If a restart does not fix the issue, your IT team can review this Microsoft support thread for further troubleshooting options: ​Microsoft Tech Community: OLE Action Error in Excel

Another solution that has worked for some users is performing a repair installation of Microsoft Office. This can be done through the Control Panel or Settings menu, depending on your version of Windows.