What type of email do you use for your personal account? @outlook.com, or @gmail.com for example, or are you using work email address?
If you are using free email address like outlook or hotmail or gmail, go to a web browser, if possible, do it on computer, not phone.
Please sign into https://portal.azure.com
Then click on Manage Entra ID
Then click on Manage tenants.
Do you see the organization listed? If so, check th box and click on "Leave".