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Unable to cast COM object of type error

The reason why you get this error is that you have two versions of the same program on your device.
The first is Microsoft 365 the second is a pre-installed version of Office which causes the problem and which you have to get rid of.

1. Find the package

Hit windows button

write down Add or remove programs

2. Uninstall package

Uninstall preinstalled office package

this is not main Microsoft office

COM error is caused by conflict between two versions

and you need to get rid of that one

3. Microsoft 365 Online repair

From control panel enter your programs

find Microsoft 365 right click on that > change

choose online repair

4. Restart the Device

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