Error "Invalid data has been used to update the list item. The field you are trying to update may be read only."

+20

When using the Create Item action to create a Document Set with a people picker field, the following error might occur:

Failed to create item. Invalid data has been used to update the list item. The field you are trying to update may be read only.

Create a single line of text variable named txtUserName.
Add a Regular Expression action to replace i:0#.w[|] from the user with nothing and store in txtUserName.
Use a build string action to add -1;# to the beginning of txtUserName and store in txtUserName.
Log the variable to ensure formatting is correct.
Assign txtUserName to the people field when creating the document set.

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