I need help with Process Automation Superbadge Challenge # 5.
I cannot get through this challenge. I am keep getting error messages. When I activate the process It gives me following error
Challenge Not yet complete... here's what's wrong: 
There was an unexpected error in your org which is preventing this assessment check from completing: System.DmlException: Insert failed. 
First exception on row 0; first error: FIELD_CUSTOM_VALIDATION_EXCEPTION, You Need Approval From Manager.: []

Validation Rule: for high value opportunities. 
Amount  > 100000( this is my validation rule)

I also try this validation rule as well but got the different error:
AND( 
IsClosed = TRUE, 
Amount > 100000, 
Approved__c <> TRUE 
)
Challenge Not yet complete... here's what's wrong: 
There was an unexpected error in your org which is preventing this assessment check from completing: System.DmlException: Insert failed. First exception on row 0; first error: CANNOT_EXECUTE_FLOW_TRIGGER, The record couldn’t be saved because it failed to trigger a flow. A flow trigger failed to execute the flow with version ID 3011N000000EJ8H. Flow error messages: An unhandled fault has occurred in this flow
An unhandled fault has occurred while processing the flow. Please contact your system administrator for more information. Contact your administrator for help.: []

When I Deactivate the process:
I got this error
Challenge Not yet complete... here's what's wrong: 
A new Opportunity with a 'Prospecting' stage for a 'Prospect' Account did not successfully create a Task for the Account owner with the Subject 'Send Marketing Materials'.

This doesnt make any sense to me because in my ORG I was able to verify the challenge. It did created the Robot Setup Record an also created the Task for the Opprotunity Owner.
Also I am getting this error message i my email
Error element myRule_9_A1 (FlowActionCall).
This approval request requires the next approver to be determined by the Manager field. This value is empty. Please contact your administrator for more information. 
What I am getting this error messages there is something wrong with the Approval Process or the Validation Rule. But I dnt know how to fix this.
One thing I have noticed that When the Opportunity is created with the Stage Negotiation it give me following error in my org.
This is when the Opp stage is Negotiation.




Here is my Approval Process:






 


 

I've a Login with salesforce functionality enabled in my application. When I generate a login oauth url which consists of app secret and ket and after sending a get request using browser It redirects me to a previously used cache instance url.

It should redirect to https://login.salesforce.com/?ec=302&startURL=%2{someurl}

but instead it's redirecting to https://myinstance.salesforce.com/?ec=302&startURL=%2{someurl} although I'm logged out of salesforce and this url only accepts my login credentials which are linked with my instance where as login.salesforce.com accepts anyone's login credentials.

if I use incognito window it works fine and I've even tested the oauth url using postman the response is a html file which has javascript function which redirects to login.salesforce.com/?ec=302&startURL=%2{someurl}
Is there anyway I can solve this issue or force my oauth url to redirect to login.salesforce instead of cached url.