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Normally, when you purchase Exchange Online Plan 1, you should receive an email notification containing the username and password for the subscription. This message is sent to the email address you used during the purchase process.
Please search your mailbox for any emails related to your subscription details, as the information is usually included there, as mentioned by the Q&A Assist.
I hope this helps you move forward. If you have any other questions, feel free to let me know.
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