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I remember this trope being subverted in an epsiode of Goodnight Sweetheart.
Basically, the main character tried to set up a fund in the 1940s then cash it out when he returned to the ’90s. Unfortunately the bank folded in the ’50s and as he hadn’t been available to be contacted, he was considered lost and the money instead absorbed into administration costs.
They also subveted it in an episode of Crime Traveller, where the main character tried to win the lottery by taking the winning numbers back and getting a colleague to buy a ticket for him. When he returned, he discovered his colleague had read the numbers upside down and the win wasn’t anywhere as big.
Another one is sending a Western Union Telegram to be delivered sometime in the future. In “Timeless” Wyatt tried that to prevent the death of his wife in the future past.
Lucy apparently didn’t have the heart to tell him it wouldn’t work because she died after January 27th, 2006 when Western Union delivered its final Telegram.
The last Western Union Telegram to have been delivered was lost for 50 years before being found and mailed. https://www.washingtonpost.com/local/in-1969-someone-sent-robert-fink-a-telegram-it-was-finally-delivered-last-month/2019/02/18/a0dd0150-3394-11e9-af5b-b51b7ff322e9_story.html