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1) Enable guest access at tenant level In the Office 365 Admin Center, go to Settings > Security & Privacy, choose Edit (under Sharing). Click on Site Settings to allow users to share SharePoint Online and OneDrive for business content with people outside the organization.
On your team site, click Site Actions and then select Share this site from the drop-down menu. Enter the e-mail addresses of the external users you want to invite either as a visitor or a member. Any valid e-mail address can be used for the invitation.
How are external users managed in SharePoint Online?
External users are managed from a site collection by site collection basis. An external user account will have to be removed from each site collection to which the account was given access. You can do this from the SharePoint Online user interface or through the SharePoint Online Management Shell, depending on your version of Office 365.
How does external sharing work in Microsoft SharePoint?
The external sharing features of Microsoft SharePoint let users in your organization share content with people outside the organization (such as partners, vendors, clients, or customers). You can also use external sharing to share between licensed users on multiple Microsoft 365 subscriptions if your organization has more than one subscription.
Solution 1 Determine which account has access as an external user. Sign in as the external user account that you used to accept the invite. 2 Remove the incorrect external user account. External users are managed from a site collection by site collection basis. 3 Clear the browser cache.
Upon clicking that, you will get to another landing page where the user is promoted to choose the type of account. If the user has a Microsoft based mail accounts like live.com, hotmail.com, outlook.com etc. you can choose the Microsoft Account.