Rest API throwing 404 when I fetch or create an issue

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Hi Team

I'm able to access the REST endpoint to fetch the project details 

https://<subdomain>.<companyName>.com/rest/profields/api/2.0/search/project

but when I tried to fetch issue list with below and point, its throwing 404 

https://<subdomain>.<companyName>.com/rest/profields/api/2.0/issue/ - GET - to get all issues
https://<subdomain>.<companyName>.com/rest/profields/api/2.0/issue/DAGVA-40412 - GET - to get a selected issue

also same way unable to create an issue with endpoint https://<subdomain>.<companyName>.com/rest/profields/api/2.0/issue - POST

it always throwing 404