Were you seeing a message about a number being unavailable? If one is unavailable then according to Apple it will say that (see below).
Some contributors to this forum will reply with a definitive statement saying you absolutely must use a different number. What Apple says is in this support article: If you can’t create an Apple Account or see “your account cannot be created at this time” - Apple Support and is more nuanced, saying that if you see a message telling you to use a different number then you do need to use a different number.
“If you’re trying to create an Apple Account and see a message that says the email address or phone number is unavailable or can’t be used, then an Apple Account already exists that uses it. Try a different email address or phone number, or reset your password for that account ( If you forgot your password and can’t sign in to your Apple Account - Apple Support ).”
The easiest way to find out if you can use the same number is to try it.
Check Apple’s list of solutions for seeing that "at this time" message —> If you can’t create an Apple Account or see “your account cannot be created at this time” - Apple Support
If it’s not a problem with your connection to Apple then it may be a problem with your data entry. “At this time" is unfortunately a somewhat vague Apple catch-all error message. It could mean that you cannot connect to the Apple service you need to use, or it could mean there is something invalid or missing in your information entry and once you correct that, _then_ it is time. ;-)
- Check if the problem actually is at Apple’s end of things and if there’s an issue with Apple's servers: Apple - Support - System Status
- Completely remove (don’t just disable) any VPN you are using.
If those do not resolve the issue, there is probably something Apple doesn’t like about your information. Check what you are doing is valid (such as when creating an account, that all your information is internal to the country in which you are creating the account) and has ALL the information required (scroll down to see if there’s more off the bottom of a page). Confer with Apple's documentation about the action you are trying to do.
If you still have problems, contact official Apple Support:
For help with Apple Account issues, click here ➞ https://getsupport.apple.com/?caller=cups&PGF=PGF63005
Click here --> Choose your country or region - Official Apple Support Select your country, then a product. If you don't see one that handles your issue then keep experimenting with selections until you reach one that gets you a chat session or a telephone call and get the representative to redirect you.
or:
Contact Apple for support and service --> "See a list of Apple phone numbers around the world."
Click here --> Contact Apple Support - Apple Support