Certificates, Identifiers & Profiles facing an issue to access this page

sanskar128 wrote:

So how can I be the part of or a member of an organisation, so that i can access this page

That would be up to the particular organization that you would need to become affiliated with and with you enrolled as an individual developer, or you would need to register as an organization with Apple Developer program.

And I do not know which Apple developer webpage you’re attempting to access here, or why.

What problem or issue or concern or limit or requirement—past attempting to access this particular and unspecified webpage—are you seeking to address?

iCloud Calendar supports CalDAV, and uses CalDAV authentication.

Implementing CalDAV is unrelated to the Apple Developer Program, past potentially using developer tools to create, build, and test the code.

Credentials are those of the associated Apple ID, or an app-specific password.

https://developers.google.com/calendar/caldav/v2/guide etc.

If you are trying to use Sign In with Apple as it would appear here (and which is unrelated to CalDAV) yes, you will need (paid) developer program membership, either as an individual minimally or as an organization.

sanskar128 wrote:

Hey there I am trying to implemented application where apple user login and sync there calendars with our calendars

To access iCloud calendar data, use CalDAV, or one of the existing CalDAV tools.

https://en.wikipedia.org/wiki/CalDAV

The credentials are those of the user’s Apple ID, or an app-specific password.

That’s usually because the webpage is intended for team members of an organization, and organization members.