Hi @TIC
According to the screenshot, this is an email invitation sent to you by another organization you joined. If you don't need to work with another organization now, you can leave the organization. Follow these steps:
- To view the organizations you belong to, first open your My Account page. You either have a work or school account created by an organization or a personal account such as for Xbox, Hotmail, or Outlook.com.
- Select Organizations from the left navigation pane or select the Manage organizations link from the Organizations block.
- The Organizations page appears, where you can view and manage the organizations you belong to.
- Home organization: Your home organization is listed first. This organization owns your work or school account. Because your account is managed by your administrator, you're not allowed to leave your home organization. You'll see there's no link to Leave. If you don't have an assigned home organization, you'll just see a single heading that says Organizations with the list of your associated organizations.
- Other organizations you collaborate with: You'll also see the other organizations that you've signed in to previously using your work or school account. You can decide to leave any of these organizations at any time.
For more details, you could refer to:
https://learn.microsoft.com/en-us/azure/active-directory/external-identities/leave-the-organization
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