Hi Ahmed,
You may have already had an answer for this given the time since you asked, but I thought I'd respond anyway in case it helps you or anyone in future.
So the way the credential import works is that, for security reasons, none of the sensitive information in the credential (i.e. the passwords) gets included in the release when it is exported. This is to prevent accidentally sharing such information upon sharing a release, but is also set up to expect different accounts in different environments.
There are ways and means of storing these outside of Blue Prism, such as tools like LastPass, so you can easily refer back to them when needing to migrate a credential to a new environment. Other options are asking IT for a password to be reset when migrating, or indeed using different accounts in each environment.
Hopefully that provides some insight for you.
Kind regards,
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Sam Stone
CoE Build Lead
Blue Prism
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Sam Stone
CoE Build Lead
[CompanyName]