First off, marriage isn't a Sacrament for Protties. Marriage is a celebration & in cases where the couple had been living in sin, the marriage is an open sign of repentance.
Back in 1976, I asked the minister of the ELCA church that I had gone to as a child to perform my marriage ceremony. He told me that he'd do it only after I had rejoined the congregation & that meant regular attendance for a year.
My husband to be was a lapsed Catholic. He knew better than to ask the pastor at the church he'd been a member of as a child, but we found two other Catholic churches that were quite willing to perform our marriage Mass.
What's the Catholic Church's current teaching on funeral Mass & burial for those who've committed suicide?
“First off, marriage isn’t a Sacrament for Protties.”
Yes, which is why you will find priests very reluctant to deny it to people who otherwise meet the requirements.