We resided together for 5 years before i flew here as PR, our Lawyer suggested that it should be conjugal partner
2) We never applied for TRV as we are like the PR would come in time.
3) please see this too "For example, a foreign partner may be from a country where divorce is not possible or where same-sex marriage is not recognized. Such partners may not be able to obtain long-stay visas in order to live together and meet the cohabitation requirement for common-law partners. When the option of marriage is not available, such couples could be permanently separated. In all other respects, conjugal partner couples are similar to a common-law couple or a married couple."
https://www.canada.ca/en/immigratio...ss-determining-spouse/assessing-conjugal.html
You should order your gcms notes - immediately.
Most importantly:
The issue you have is that when you applied to become a PR, you should have included your partner as your common-law partner. Because you met the test for common law at that point. (Your lawyer should know this).
Because you did not have any such issue about residing together before - and when you applied, you failed to disclose your common-law partner, a misrepresentation that could (and by rights should) make your partner ineligible for sponsorship by you, forever.
Order your GCMS notes - immediately. You need to know if this is being looked at by IRCC.
Secondary discussion: I would have suggested your partner apply for a TRV (because if your partner is granted one, you do not need a 'long-term' visa - your partner could simply arrive in Canada and marry you). You would apply/would have applied for sponsorship then and partner could extend his stay - something routinely done for married applicants. This is something they typically look for in conjugal partnerships, that there is both a legal and immigration barrier. But this is secondary to the issue above.