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This may be a long-shot, but is there anything special about your email address, such as a special character in it? As an example, Fastmail supports plus addressing, and a plus sign "+" is technically a valid character for the username part of an email address. Nevertheless, many web sites have a check for valid email addresses which will not allow a plus sign. Frustrating. The worst would be for a web site to accept it at one point, then later revise their software so that it neither works nor can it be changed.
There are also other special characters which technically can be part of a username but might be screened out by faulty software.
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