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Marcia Hooper 1Marcia Hooper 1 

Why do I keep getting an incorrect data type for my 18 digit ID when using dataloader?

SwethaSwetha (Salesforce Developers) 
HI Marcia,
Your scenario seems similar to https://salesforce.stackexchange.com/questions/334496/dataloader-update-error-account-id-id-value-of-incorrect-type-001xxxxxxxxxxx

Please check if there are any special characters in the 18 digit ID.Try https://freetools.textmagic.com/unicode-detector

Also, make sure the provided Id's are correct as they seem to be case sensitive as explained in the above link

Related: https://help.salesforce.com/s/articleView?id=000339844&type=1

If this information helps, please mark the answer as best. Thank you