
RabiulA.72028 (Customer) asked a question.
I have created three days before one single page application that uses OIDC template.
I have used HTML and JS only using https://global.oktacdn.com/okta-auth-js/7.3.0/okta-auth-js.min.js
Previously login event redirects the Okta login page. Now that page returns 400 status code .
Please help me on this...

Hello @RabiulA.72028 (Customer) , thank you for contacting Okta Community!
I've reviewed our documentation for something relevant. It looks like your question is more appropriate for our dedicated Okta Developer Forum. I advise reaching out via devforum.okta.com as they will have more insight into this topic.
In the meantime, you can reference this articles:
Error "400 Bad Request" when Redirecting to the /authorize Endpoint with no Error Description
While we'll do our best to answer your questions here, this medium is more inclined towards Okta's core products and features (non-developer work).
Regards.
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The error code refers to the Policy. Under Security - API, click on the Authorization server you are using and then go to the Access Policy. Make sure you have the right Grant Type and the correct scopes. Also, because you said it worked before, check your token options.
If you don't have a policy for your app, I would suggest that you create one. It may make it easier to troubleshoot.
check the authorization server policy to see if there are any restrictions. and also check the okta system log to see if there is more detailed information on the error