First check the app map to see if you’re not inside a yellow zone. You cannot end your rental or return a bike in a yellow zone.
Check if you are in an open space without obstacles between the bike and the sky (roofs, trees, etc).
It’s possible that the EVieBike does not have enough mobile signal at your location to establish a connection, so try moving the bike and ending the rental a few meters further.
Poor or no signal on your phone may also be the cause.
If you still can’t return the bike, please contact our customer support.