Hello @Temp20220828j,
Welcome to the community forum and thanks for posting!
I am sorry to know that you've run into trouble while changing the phone number. Based on the information that you've shared it seems like a technical glitch on the website. In this case, I would recommend you try some troubleshooting such as clearing cache and cookies or try using a different browser. If the issue persists kindly contact our customer support team for further assistance. Before you proceed, please take a look at this help center article to know more about things to follow while changing the phone number.
I hope this helps,
Ayesha
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