Microsoft Xcel on iPad unable to create password

In order to use the MS Excel, I have to create an account. I have entered my email OK, but when I type in my password, it is rejected. I keep getting error message that characters not allowed are in the password. Have tried many times, but still get the same error.
When I tap the password window, the keyboard pops-up, when I finish typing in the password I tap the 'next' and get the error message.
Any solutions please?

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