Hi,
If your account has only the Basic User role, there is no supported way to self-elevate and edit the solution. App sharing only grants access to use the app; it does not grant maker or solution-editing permissions.
You need an existing Environment Admin/System Administrator to assign the required role, typically Environment Maker and/or System Customizer, or System Administrator if appropriate. If the environment is no longer visible in the Power Platform admin center, your account likely no longer has admin access. In that case, please contact your IT/Power Platform administrator or raise a Microsoft Support request if no administrator is available.
