Usually your student can fix this for you, since they control your access. Ask them to try the following steps.
This section is under revision.
Students
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Sign into my.ycp.edu.
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Select the YCPWeb icon.
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Select YCPWeb for Parents > Proxy Management.
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Select Expand on the proxy who can't sign in.
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Make sure that the Start Date is set to the past and the Stop Date is set to the future.
Delete & recreate proxy
If the instructions above didn't fix the issue,
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Sign into my.ycp.edu.
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Select the YCPWeb icon.
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Select YCPWeb for Parents > Proxy Management.
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Select Expand on the proxy you want to delete.
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Select Delete Proxy Relationship.
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See the Setup section, above, to create the proxy again from the beginning.