Error 1550: UPN invalid (character 13 not a recognised value or is missing).

To check the pupil UPN please go to the student profile (search the pupil name in the top right hand search bar), go to the extended tab and under the school information heading please check the UPN here.  This error would indicate that character 13 of the UPN is not a valid value.  If the pupil is new to your school you may need to confirm with the previous school if you believe this number to be correct.  

You can find more information on UPNs from the DfE guidance found here.

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