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What are you expecting to see ? The ISS moves pretty quickly across the sky and is very reflective so although you will see some shape defintion possibly you are more likely just going to get a bright sky trail.
The few I have seen with some discernment of the ISS shape etc have been silhouetted against the moon as a backdrop or the sun through solar protected scopes.
Possibly a short high frame video avi file might do better as per planetary pix but the angle on the ISS would change quite rapidly so any detail would be blurred probably. 400mm should see it although it won't be large.
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