Does tattvatta sutra forbid in 2 souls in meeting in heaven if we both are in heaven not or yes strictest answer possible

No. The Tattvārtha Sūtra does not forbid two souls from meeting in heaven.

In Jain doctrine, devas in heaven can meet, speak, and associate according to their karmas. What is not allowed is the idea that two souls become one or that heaven removes karmic bondage by itself.

Strictest answer: No prohibition on meeting; only no merger of souls.