Hey @morningdyj 

The general behavior for this is - if none of the IDs that you have in your csv match to existing user IDs in Amplitude, then you will get this error message.

So if the formatting of the csv file,etc looks all good, then most likely the user IDs that you have in your file don’t have any event data captured in Amplitude yet.

thanks @Saish Redkar. I was able to search these users with their User ID in User Lookup, so it’s not because there is no data. 

As an alternative, I got the amplitude id for these users and uploaded those successfully. Just not sure why the user ids didn’t work.

Strange.
Maybe you can try raising a support ticket and see if a platform specialist can reproduce the error with the same list of user ids.

@Denis Holmes  @belinda.chiu  @Yuanyuan Zhang  Can you help out here?

@Yuanyuan Zhang When you have time, can you convert this to a ticket? This requires further investigation. Thank you!

@morningdyj Would you be so kind as to PM me your email address you use for Amplitude, Org ID and Project ID so we can add it to the ticket? Thank you!

@Denis Holmes Done! 

@morningdyj We have converted this post into a ticket. One of our team members will follow up on it! 

Thank you @Amplitude Admin  @Denis Holmes 

@Saish Redkar @Amplitude Admin @Denis Holmes  

Was there any update on this ticket?

I believe I’m getting the same issue on my end. 

@Mario Federis no resolution, the team asked for more info to help troubleshoot and we’re waiting to hear back. I’ve created a ticket for you so the team can take a look!