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Hi Dawid,
How are you Dawid, my pleasure to give you advice.
For this question, we would like you sir to export the schedule and see if the name matches the one with the excel file, if it still showed as the Carldoe as expected. The advice we will give you is to download the sample shift excel file, after you input the correct the working email address which belongs to users, upload again, that should be work:
Please do let me if you having further questions and I will continue following you up.
Yours Sincerely,
George