Serving one's Guru or Husband?

 mahat-sevāṁ dvāram āhur vimuktes

One can attain the path of liberation from material bondage only by rendering service to highly advanced spiritual personalities. (Srimad Bhagavatam 5.5.2)

The instruction is there, but how to we understand it depends on our realisation. We all know everyone is eager to serve Krsna and his devotees, because people have been cheated by serving materialistic persons, who just accepts service and cannot give us any benefit material or spiritual.  Although Srimad Bhagavatam encourages service to vaiśnavas is means of deliverance, there is another vedic injunction which Sri Caitanya Mahaprabhu has clearly set for his followers, female disciples to offer obeisances from a distance. Mahaprabhu, was very strict in dealings with women. For women devotees there are restrictions on the physical platform not on the spiritual advancement.

Śrī Śacīmātā offered food at home to Śrī Caitanya Mahāprabhu although He was far away in Jagannātha Purī, and when she opened her eyes after offering the food, she saw that it had actually been eaten by Śrī Caitanya Mahāprabhu. Similarly, when Śrīvāsa Ṭhākura performed saṅkīrtana, everyone felt the presence of Śrī Caitanya Mahāprabhu, even in His absence. This is another example of āvirbhāva.
CC Adi 10.56

We don't independently study scriptures outside the reference of our Gaudiya Sampradaya. It means we accept MAhaprabhu's teachings especially through the six Goswamis, who set the criterion for the future.

Before heading into the write up, let me make it clear What is Seva/ service actually?

Serving devotees means abiding by their orders