Hello
This 30-day delay is intentional. It’s a security safeguard designed to protect users in case someone else tries to hijack their account by changing recovery info. The wait gives the rightful owner time to notice and stop unauthorized changes.
Unfortunately, this policy cannot be bypassed. You can read more about it directly from Microsoft here:
If you must use the computer now, your only option is to perform a clean install, but that wipes your data, unless they were already backed up to your OneDrive. Once reinstalled, you have to temporarily use a different account to set up. Wait 30 days, then link your own account back.