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When performing a flow where you update a lookup, you may get the above error. We will briefly discuss the possible causes here.
These entities are slightly easier in that their plural is usually +s. For example accounts, contacts, organisations, …
With these tables it is a bit more complicated, as you do not always know what the plural was when created. It can always be changed in the properties of the table: 
To be really sure which name to enter in your flow, you can go to the following URL:
https://[ORG].crm4.dynamics.com/api/data/v9.1
Find the entity name and perform the action as shown below:
