Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hi
Since you mentioned that you cannot get the confirmation on iCloud.com, this sounds like an Apple/iCloud sign-in verification issue rather than an Office activation issue.
On your iPhone, go to Settings > [your name] > iCloud > Mail and make sure “Use on this iPhone” is enabled. Apple’s instructions are here: https://support.apple.com/guide/icloud/set-up-icloud-mail-mmdd8d1d47/icloud
If iCloud is asking for a confirmation/verification code, you can get the code from a trusted Apple device or trusted phone number. See: https://support.apple.com/en-us/102606
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If the missing email is actually Outlook/Hotmail rather than an @icloud.com address, please let me know which email provider you are trying to add, as the steps are different.