Hi @Bilal Imdad , this document details what "alternativeSecurityId" is. This most likely means one of your InputClaims is wrong. (Reposted here for other users)
For your follow up question, the error "AADB2C9022" is related to your authentication metadata. Please see this thread for possible solutions, which references this SAML guide. Following those should resolve your problem. Please let me know if you have any questions.
If this answer helped you please mark it as "Verified" so other users can reference it.
Thank you,
James