Sounds like it. It happens with other Google services too. Someone could share a GDoc to your non-Gmail email, but if that non-Gmail email isn’t a Google account, then you won’t be able to access the doc/comments/whatever else (depending on the doc permissions, of course).
There’s nothing that can express my disdain for Google’s reCaptcha.
😒 We’re training its AI models 😒 It’s free labor for Google 😒 Sometimes it wants the corner of an object, sometimes it doesn’t 😒 Wildly inconsistent 😒 Always blurry and hard to see 😒 Seemingly endless 😒 It’s the robot asking us humans if we’re the robots