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Step 1: Create an API token for your Atlassian account:

Log in to https://id.atlassian.com/manage/api-tokens. Click API tokens, then Create API token.

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Copy the API token.

For security reasons it isn't possible to view the token after closing the creation dialog; if necessary, create a new token.
You should store the token securely, just as for any password.

Step 2: Go to Import/Export Utility. Provide User Name and Password as below :

User Name : Email Id

Password : API token generated in step 1.

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You should be able to log in Import/Export Utility.