Can't restore Whatsapp chat history

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Hello,

I'm trying to download whatsapp chat history to my new phone and new number. It says it found a copy of the backup but cannot download. The only options are cancel or repeat, which I've done many times, but it still won't download. I've tried making another backup and restarting both phones, still nothing. Any ideas? Thanks in advance.

System Configuration: Android / Chrome 96.0.4664.45