Dear
I have a problem about connection from Flow to an external site when create a flow on Power automate
Situation:
- I'm using a domain account from my company to create a flow
- The flow will be use for another SharePoint Online site, so I need to select the Site address and List id , but I only can select the sites from my company, cannot find the site from my partner
Remark: My company & my partner using office 365
Example:
- Im is Thanh from ComanyA@.com
- A SharePoint Site from companyABC as http://ABCgroup.sharepoint.com/sites/external is already share access to me as Owner
When create flow in PA, there is error: unable to find the site address ...

When I check the connection, I only can see the site from companyA as below
I have checked the other posts, but I cannot create a connection to the external site
please help me