Windows 11 - i have a windows 11 pro OS on my recently purchased desktop computer - due to BT email shutting down I had to use a new email address i am unable to authenticate it - can you help

i have a windows 11 pro OS on my recently purchased desktop computer - due to BT email shutting down I had to use a new email address - when I did this it resulted in my current version of windows needs to be activated and although i have followed all the on screen instruction to do this i am unable to authenticate it - can you help?

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