Vagabonds had high hopes for a big result away at Oldershaw but the home side snatched the game 13-10.
Vagas led 5-3 at half-time courtesy of a Ross Pullman try.
In the second half, Leigh Kennaugh doubled Vagas’ tally but the strong Oldershaw side was too powerful for Vagas in the end.
FC Isle of Man back at The Bowl next week after U-turn
Club had initially announced tie would be moved to off-Island venue
Rugby: Nomads and Ramsey beaten in Cheshire finals
Douglas take big win in 'Old Firm' Manx Cup clash
Football: Eight progress to Hospital Cup second round
Foxdale survive scare and Colby win southern derby (Results: 12 Apr)
Jennings and Kennedy win 2025 Manx Rally
Donegal crew roar to near 40-second victory
Second round of 2025 ARA Championship taking place today
Points across the board up for grabs again at Jurby