I've tried a number of times, and no luck.
Here's what I did:
1. Entered myCIC
2. "Link an existing application to this account"
3. "What did the applicant apply for?" --> Temporary Residence --> Work permit and extension
4. Selected "Family Name, Given Name, and Date of Birth" (I have no UCI or Application Number for the OWP, right?)
5. Entered in Family Name, Given Name, and DOB
6. Entered in City and Country of birth; Passport number, country, issue and expiry dates
7. "What type of work permit are you applying for?" --> Open (initial application or extension)
8. "Current country of residence" --> Canada ; "Current marital status" --> Common-law ; "Which situation applies to the resident?" ---> (last option: "Applied for permanent residence as a spouse or common-law partner in Canada")
9. "Search for my application"
Anybody else have the same problem? Am I doing something wrong?