If you can't sign in to your Azure account after creating it with a credit card, try these steps:
Check Email: Make sure you've completed the email confirmation. Look for an email from Microsoft Azure and follow the instructions.
Clear Browser Cache: Clear your browser's cache and cookies, or try a different browser.
Verify Account Details: Ensure you're using the correct email and password.
Reset Password: Use the "Forgot password" link to reset your password if needed.
Check Credit Card: Ensure the credit card details were correct and the card is active. Issues with the card can prevent account activation.
Try Different Network: Try signing in from a different internet connection.