Hi @stapes ,
Could you please share a screenshot about your flow's configuration?
Do you add a "Request - Respones" action within your flow to return data back to your app?
Based on the JSON response that you mentioned, I think there is something wrong with the JSON schema you typed within the "Response Body JSON Schema" property of the "Response" action as below:

According to the JSON Response that you mentioned, I found that you do not define proper type for the Required properties -- "Count", "manager_lname", "manager_fname" and "manager_mname".
Please modify your Response Body JSON Schema within above "Response" action in your flow as below:
{
"type": "object",
"properties": {
"Count": {
"type": "integer"
},
"emp_key": {
"type": "integer"
},
"emp_fname": {
"type": "string"
},
"emp_lname": {
"type": "string"
},
"emp_mname": {
"type": "string"
},
"dept_name": {
"type": "string"
},
"dept_id": {
"type": "integer"
},
"manager_lname": {
"type": "string"
},
"manager_fname": {
"type": "string"
},
"manager_mname": {
"type": "string"
},
"grp_name": {
"type": "string"
},
"LastUpdate": {
"type": "string"
}
},
"required": [
"Count",
"emp_key",
"emp_fname",
"emp_lname",
"emp_mname",
"dept_name",
"dept_id",
"manager_lname",
"manager_fname",
"manager_mname",
"grp_name",
"LastUpdate"
]
}
Within the "Response Body JSON Schema" property of the "Response" action in your flow, please define proper data type for these Required properties listed within the "required" array table.
The user @johnmarlowe has faced same issue with you, please check the response within the following thread:
https://powerusers.microsoft.com/t5/Building-Power-Apps-Formerly/Registering-Error-when-trying-to-add-a-flow/m-p/142010
After that, save your flow, and then re-create a new connection to your flow from your app, check if the issue is solved.
Best regards,