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Raghu PedabbaRaghu Pedabba 

Login Error : Your login attempt using single sign-on with an identity provider certificate has failed. Please contact your salesforce.com administrator for more information.

Hi Experts,

I am getting this error (Your login attempt using single sign-on with an identity provider certificate has failed. Please contact your salesforce.com administrator for more information.) when I try to login using https://abc.my.salesforce.com , but it works fine when I login thro' test.salesforce.com.

Any pointers on, how to resolve this ?

Regards,
Raghu

ShashankShashank (Salesforce Developers) 
If you are logging into a sandbox, please check the right MyDomain url for the sandbox. If you implement My Domain in a sandbox environment, the URL format is https://<subdomain>--<sandboxname>.<instance>.my.salesforce.com.