See this for more details:
Windows phone can't connect
I have tried to set up several phones but none of them will let me sign in to my Microsoft account. It just tells me "we Can't connect right now. Please wait a few moments and try again.
Windows for home | Other | Devices and drivers
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Anonymous
2021-06-27T19:37:03+00:00 I already saw that post, actually. I tried what was listed, to no success.
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RedSpook-9082 4,765 Reputation points Volunteer Moderator2021-06-28T11:14:56+00:00 I already saw that post, actually. I tried what was listed, to no success.
That's because the only solution is to update your phone to Windows 10 Mobile but this cannot be done as it is not supported for it. I'm sorry to say it, but your phone was already a brick in 2017. It cannot be saved/fixed. Try to get your money back if you can and buy a non-Windows phone instead.
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Anonymous
2021-08-15T21:16:10+00:00 I have updated my Lumia 730 to windows 10. but I get a "Please try that again" error message with code 0x80131500 when I try to access the store or weather.