SQL Login and Common Table expressions

We have given access to an SQL database (but is not ours) and we have been told that to run a query we have to use a specific login, we are trying to run a common table expression query, but if we use it with the login, we get an error ("incorrect syntax" please see attached image)  if we comment out the first line it seems to accept it (please see attached image) it just doesn't display the results because we don't have the permissions as expected

What would be the correct syntax to run a CTE having to use a specif login?

Thank you
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Rich WeisslerProfessional Troublemaker^h^h^h^h^hshooterCommented:
Terminate the 'execute as <>' line with a semicolon (;)

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ODA-ITAuthor Commented:
Thank you, that solved the whole error
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Microsoft SQL Server

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