04-09-2019 02:49 PM - edited 04-09-2019 02:51 PM
Have you tried enabling and disabling the remote access on the Wemo App, rkoertje? How about using a different handheld device? If not, please try to do so.
Please also refer to this link: https://www.belkin.com/us/support-article?articleNum=288072.
If the issue still exists, email us at WemoCares@belkin.com and include the following details on the email below for 2nd Level Escalation.
-Wemo device MAC Address and Serial number
-Wemo App and OS version of your handheld device
Wemo Technical Support