I've tried this GET method but I just get an invalid type cast error:
https://sandbox.com/entity/Default/22.200.001/Customer?$expand=PrimaryContact&$filter=PrimaryContact.Email eq 'kylelauridsen86@gmail.com'
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You should use / to specify a field of a child entity.
{{sitename}}/entity/Default/23.200.001/Customer?$expand=PrimaryContact&$filter=PrimaryContact/Email eq 'dean@bartending.con'
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