In Salesforce names don't mean anything it is the Campaign ID that identifies the campaign.
You should use the look-up feature, click on the campaign and then it will select the proper campaign. Copying and pasting the "name" of a campaign will not work. When you lookup the campaign, search for it and click on the name it will save the ID for the campaign but shows the campaign name which is purely cosmetics.
Click on the campaign look-up
In the pop-up window search, find, and click on the campaign name
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