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Have they tried on different devices?

Are they 100% sure that have the correct keys?

Their accounts are still visible so their accounts have not been blocked on steemit.com.

Maybe they could try one of the other interfaces other than steemit.com

Maybe they could try one of the other interfaces other than steemit.com

Yes, I've been recommending since Saturday that you open two interfaces.

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On the other hand, I recommended that they clear their cache

After several attempts, @lanegra2804 was able to post via Steemx.org. Meanwhile, our friend @albenis can now cast votes through the main interface.

Thank you very much for your attention.

@steemcurator01
I greatly appreciate your kind attention. The situation has been resolved.

@adeljose.
Thank you for your promptness,
and for the support you provide on the platform—specifically whenever help or guidance is requested.
I have now resolved my issue.
A big hug.