1Password won't run from SD card on Samsung Galaxy J 2017

Brendan, thanks for this information. Several things about your reply seem a little odd to me:
Re the capabilities of the SD card:
- The card is a 256 GB SanDisk Extreme PRO. Its App performance rating is A2, the fastest you can get; and the Video Speed Class is v30. I don't notice any significant performance degradation running other apps on it, compared to Internal memory.
- In all my experience with software, the only circumstance in which I can imagine memory speed having a functional impact on software execution would be in a tightly-specified real-time environment; which is not the case here. Almost all programs would simply run more slowly.
Re "non-standard installation method":
- As with all my other apps running from the SD card, the installation is perfectly normal, and the app is placed into Internal storage. I then use the standard Android utility to move it to External storage, which simply involves copying the code and adjusting (where necessary) any links to system calls and so on.
- If the developers have good reason to believe that there are esoteric coding techniques used in 1Password which mean that it cannot in principle execute correctly from external storage, I believe it is possible in the Manifesto to mandate placement in internal storage (rather than recommending it, as it currently does). This could be used, and would need to be mentioned in the product documentation, as it is very unusual in non-System software.
If at all possible, could you copy/escalate this discussion to the development team for comment?