His first tenure of office as subprior was interrupted by the exile of the community from Agnetenberg (1429). A dispute had arisen in connection with an appointment to the vacant See of Utrecht. Pope Martin V rejected the nomination of Bishop-elect Rudolf van Diepholt, and imposed an interdict. The Canons remained in exile in observance of the interdict until the question was settled (1432). During this time, Thomas was sent to Arnhem to care for his ailing brother. He remained there until his brother died in November, 1432.