Post message to new channel - ChannelID does not exist

Regular Contributor

Hello Everyone,


I have a requirement to create a channel at runtime dynamically and then once it is successful, post a message to the newly created channel using the Flow.


I have added two steps to handle this scenario and in second step i configured it to be executed after the success of channel creation & also set it to be synchronous operation.


Still, i get the below error - Can anyone suggest the possible solution for this issue.



  "error": {


    "message""channelId needs to be a valid GUID.\r\nParameter name: channelId",

    "innerError": {








Thanks & Regards,


3 Replies
best response confirmed by bhanu chintha (Regular Contributor)

I created test Flow to try this out and it worked fine for me. My Flow created a channel called "TestJeff" and then posted the msg "Test Channel Creation" in the newly created "TestJeff" channel. Here is how my Flow was set-up. I hope this helps.



Hello Jeffrey,


Thanks for the quick reply.


May i know how the Id of the new channel is being captured and used in the second step. I am taking the name of the channel from PowerApp form as shown below (attached) - 





Thanks & Regards,


I am able to take the ID of newly created channel. Thanks a lot for your suggestion.



Thanks & Regards,