Can I have a form in a channel that will post in the conversations tab any time it gets filled out?

OK, I was able to get the Post to Channel thing working, but all the posts have my name on them since it's my Flow so that's not going to work.

I found some other pages about using a Card to make the post and that sounds like it would work great.  I started looking at the Webhook idea but apparently the HTTP action is a Premium feature so I can't use that.  But then I noticed that there's an action under Teams called: Post your own adaptive card as the Flow bot to a channel.  That sounds like exactly what I need.

So, I set everything up but now I get an error when the flow runs that simply says:

Action 'Post_your_own_adaptive_card_as_the_Flow_bot_to_a_channel' failed

The specified Teams flowbot adaptive card request is missing or invalid.

Any idea what that means?

Here's my Card info in case that helps.

Thanks.

{
"$schema": "https://adaptivecards.io/schemas/adaptive-card.json",
"type": "AdaptiveCard",
"version": "1.0",
"body": [
{
"type": "ColumnSet",
"columns": [

{
"width": "stretch",
"items": [
{
"type": "TextBlock",
"text": "ACED IT"
}
]
}
]
},
{
"type": "ColumnSet",
"spacing": "large",
"separator": true,
"columns": [

{
"width": "stretch",
"items": [
{
"type": "TextBlock",
"text": "**@{body('Get_response_details')?['r4bc2e11a0eaf4839b4a4fbe0d0420a41']} got an Aced It!**"
},

{
"type": "TextBlock",
"spacing": "small",
"isSubtle": true,
"wrap": true,
"text": "@{body('Get_response_details')?['r37a7fa26eb234a488418e20fbfe1bdba']}"
},
{
"type": "TextBlock",
"spacing": "none",
"isSubtle": true,
"wrap": true,
"text": "From: @{body('Get_response_details')?['responder']}"
}
]
}
]
}
]
}