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  1. Well you might try calling beginTransaction and...

    Well you might try calling beginTransaction and endTransaction in your code to manually switch between the two.

    There are two separate SPI ports underneath the Teensy 4.0. For accessing a SD...
  2. You might try adding 2.2K pull-up resistors...

    You might try adding 2.2K pull-up resistors between each of the two CS pins. A pull-up resistor is connected in parallel between the pin and 3.3v. This comes from this page of how to make better...
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