Strictest answer: No, the Tattvārtha Sūtra does not explicitly forbid merely meeting or interacting with a soul in Dev lok.

But in strict Jain conduct, one should not develop attachment, desire, reverence-based dependence, or worldly involvement with devas. Contact itself is not the main fault; attachment and karmic bondage are the fault.

So the correct strict Jain view is:

• Meeting/interacting = not directly forbidden
• Getting attached / seeking favor / emotional dependence = not approved
• For monks and nuns, such interaction is generally avoided unless necessary

In short: No for simple meeting, but yes to avoidance of attachment.